I am having this problem, and it’s particularly frustrating because I’ve uploaded several topical interviews in the last day and people are struggling to access them.
In Chrome it loads the flash player instead of the html5 player and then says “Movie not loaded…” Some people have reported this in Internet Explorer too. In Firefox on my computer I got only a download link instead of a player.
My website is https://www.latentexistence.me.uk/ but I have dropped in a different audio player plugin for now so you won’t see the problem. That seems to be flash only so it still isn’t a solution though.
